If your running synthetic your good for up to the 300's in temps. But don't get fooled by the hype, these modern engines run best with the oil temps being high. Trans oil is a different sorry. I have never seen no more than 30* difference between my coolant and oil temps. And this is with turbo's in the Atlanta heat and dyno run with heat soak.

I was at an auto cross and my oil temp was close to 260-270 I'm not ok with that. It was way on the high side of my gauge, not quite on the red but way high none the less. I'm in south east FL and its really hot already so yeah I do think this is necessary. Especially if I plan to do more events, which of course I will.